Water-based gel casting method for structural ceramics

A technology of water-based gel injection molding and molding method, which is used in ceramic molding machines, manufacturing tools, etc., can solve the problems of large residual stress of ceramic blanks, poor processing performance, easy to wear tools, etc., and achieves high density and reduced Residual stress, the effect of improving plasticity

Inactive Publication Date: 2013-12-04
无锡特科精细陶瓷有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there are many researches on gel injection molding at home and abroad, but there are few companies that actually use this process to make structural ceramics. One of the main reasons for this is that the residual stress of the ceramic body is caused by the high rigidity of the polymer. Large, so that defects such as cracking and deformation occur in the green body during the drying process, and although the green body has high strength, the processing performance is not good, the tool is easy to wear, and the product is easy to crack

Method used

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  • Water-based gel casting method for structural ceramics
  • Water-based gel casting method for structural ceramics
  • Water-based gel casting method for structural ceramics

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The experimental process is as follows:

[0026] (1) Put the organic monomer and crosslinking agent accounting for 1wt% of the raw material solution into a beaker, the mass ratio between the organic monomer and the crosslinking agent is 5:1, and then add 8wt% deionized Fully dissolve the organic matter in water to prepare an organic matter solution, then add a dispersant accounting for 0.5wt% of the raw material solution to the prepared organic matter solution, stir and mix thoroughly, and adjust the pH value between 8-11 with ammonia water and acetic acid. Wherein, the organic monomer is acrylamide or methacrylamide, the crosslinking agent is methylene bisacrylamide or poly(vinyl glycol) dimethacrylic acid, and the dispersant is Ammonium citrate, polyacrylic acid and its copolymers (PAA) or polyethyleneimine.

[0027] (2) Add a plasticizer accounting for 20wt% of organic monomers to the above solution, and stir evenly to make a raw material solution. The plasticizer ...

Embodiment 2

[0033] In this example, the organic monomer and the crosslinking agent accounted for 2wt% of the raw material solution, the weight ratio of the organic monomer to the crosslinking agent was 10:1, and the others were the same as in Example 1.

Embodiment 3

[0035] In this example, the organic monomer and the crosslinking agent account for 3 wt% of the raw material solution, the weight ratio of the organic monomer to the crosslinking agent is 20:1, and the others are the same as in Example 1.

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Abstract

The invention provides a water-based gel casting method for structural ceramics. Organic monomers, cross-linking agents and dispersing agents are dissolved in deionized water to be prepared into a mixed solution. Plasticizers are added in the mixed solution to be prepared into a raw material solution. Ceramic powder is added in the raw material solution and subjected to ball milling to obtain a ceramic slurry; initiators and stimulation agents are added in the ceramic slurry, bubbles dissolved in the ceramic slurry are removed in vacuum after the mixture is evenly stirred, and the mixture is injected in molds to be molded to obtain solidified wet ceramic blanks; the solidified wet ceramic blanks are dried to obtain dry blanks, and the dry blanks are subjected to processing and thermal treatment to be produced into ceramic products. In the technological process, glycerol or Tween 80 is used as plasticizers, so that the plasticity of the molded blanks is improved, residual stress of the blanks is reduced, defects such as cracking during drying are prevented, the ceramic blanks are high in compactness, good in plasticity, uniform in structure and suitable for batch industrial production.

Description

technical field [0001] The invention relates to the field of ceramic preparation, in particular to a water-based gel injection molding method for structural ceramics. Background technique [0002] In the current industrial production, the requirements for materials are becoming more and more stringent. Structural ceramics are more and more widely used in various industries due to their excellent mechanical and thermal properties. However, due to the high hardness and high brittleness of structural ceramics, the processing and production of structural ceramics is a high-cost matter, which limits its application. Therefore, people have invented and created many methods to break through the bottleneck of processing cost, so as to prepare ceramic products of various complex shapes with as little processing as possible. These methods can be collectively referred to as near net size forming methods, and most of them are based on wet forming to achieve this purpose. However, ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B28B1/26C04B35/624
Inventor 刘名剑
Owner 无锡特科精细陶瓷有限公司
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